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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5576f0c7fe6ddaa3a70dde61ba2b2ef253761539725dcb4891daf7e262577d9d' 
  AND token = 'Bn1oakiTClYiiHqNr1haY9IFG25kx3tz3XKgyRvMJTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}